A car slowing to a stop at a red light.
A car speeding up when the lights go green.
An aircraft taking off or landing.
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A body moving with constant speed in a circular path has acceleration changing at every point.
The '500 km/hr' part is certainly an example of speed. Speed = Distance/Time.The inclusion of a direction makes this an example of velocity.
Kilometres per hour (speed), grams per millilitre (density).
The speed triangle is a good example. The faster you go, the quicker you will arrive at your destination.